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This article contains the findings of experimental research into determination of the liquid volume passed through forest fuel bed (pine needles) without burning and during its thermal decomposition. The experiments were carried out using hollow cylinders with fixed geometric parameters (height hf and diameter df) for creating model of fire sources. When analyzing the results we determined the dependences of the drops mass after the passage of the forest fuel bed as a function of the initial mass. All necessary conclusions about the way drop volume effects on the mass loss after passing through a forest fuel bed are included.